Calculation results reveal that the equivalent beam length is more suitable to describe the beam size of vortex beam after propagation. 数值计算进一步说明,等效光斑尺寸更适合用来表征涡旋光束传输后的光斑大小。
Research on test method of resistance loss and equivalent length of valve on tube for gas 气态介质条件下阀门管件局部阻力损失与等效长度测试方法的研究
Full-Port ball valves provide pressure drop equal to equivalent length of pipe, and even slightly better than gate valves. 不缩径,全流道球阀提供的压降安全取决于管道的长度,甚至比闸阀还要好一些。
Through the calculation of amendatory stress intensity factors of the crack-tip under the condition of small scale yielding, the disadvantage of the method of equivalent crack length is found. 简要介绍了断裂力学的发展,通过在小范围屈服条件下裂纹尖端修正的应力强度因子的计算,发现用等效裂纹长度方法的不足。
Calculation of Local Resistance of Gas Pipeline by Equivalent Length Method 燃气管道局部阻力的当量长度法计算
Take 0.72S ( the arc length of the arch axis) as the equivalent length and the inner forces at the springing section as the acting forces when the arch loads are asymmetrical; 对于非对称荷载,等效长度可取0.72S(S为半跨拱轴线弧长)、采用拱脚截面内力作为作用力;
Darcy's formula is used for hydraulic calculation of gathering station piping, Colebrook equation used for determination of friction coefficient, and pressure drop from local resistance is determined using equivalent length method. 站内管路水力计算采用达西公式,摩阻系数采用科尔布鲁克公式,局部阻力压降采用等效长度法。
This paper based on the example, the variable section step-shaft with spline or slot, and according to equal rigidity condition, Presenting calculable formula of equivalent length in accordance with the shaft under torsional working condition. 以机械传动中所常见的开有花键或键槽的变截面阶梯轴为例,根据刚度相同条件,推导出了在扭矩作用下变截面阶梯轴所对应的当量长度的计算公式。
Equivalent length of warp yarn and its change 经纱的等效长度及其变化特点
Based on this condition, a concept of equivalent span length is proposed. 同时,在此基础上,还提出了等效跨长的概念。
The two α-globin genes of yak had equivalent length of 706 bp and their intergenic region had the length of 2.47 kb which is farther than that of goat. 牦牛的两个α-珠蛋白基因长度相等,都为706bp,且间距为2.47kb,距离比山羊的远。
Equivalent Length Method for Calculating the Torsion Rigidity of the Variable Section Step-shaft 用当量长度法确定变截面阶梯轴的扭转刚度
Utilizing the method of equivalent cavity length, the effect of cavity length to photons life is analyzed. The high frequency response characteristic of FBG-ECL is taken into account combined rate equations. 利用等效腔长的手段,分析了腔长对光子寿命的影响,并结合速率方程讨论了FBG-ECL的高频响应特性;
Based on the principle of energy balance and equivalent optical length, a series of formulas have been derived. 本文根据能量平衡和光程相等的原理,导出一组非平行入射光束的整形器面形设计公式。
And then, the so_called equivalent length is redefined by using the basic concept of modeling of strain localization. 等效长度的概念具有了明确的物理含义,且几个基本模型在理论基础上达到一致。
The buckling equivalent length of a pile is not only used in the buckling of the pile but also one of the necessary parameter checking the material strength of the pile. 基桩的稳定长度不仅用于基桩的纵向屈曲问题,而且也是桩身材料强度验算必不可少的参数之一。
This paper points out problems existing in the determination of the effective length of reinforced concrete frame columns adopted in current concrete structure design codes of various countries and clarifies the correct implication of equivalent length which determines the second order moment in critical sections of the column members. 本文在指出各国设计规范对钢筋砼框架柱计算长度取值方面存在的问题之后,给出了确定框架各柱单元控制截面二阶弯矩所用的当量长度的确切含义。
Besides, the behaviour of plastic hinge at the member end of RC frame in process of loading is discussed and the empirical formula for calculating the equivalent length of plastic hinge is also given. 此外,还讨论了加载过程中钢筋混凝土刚架杆端塑性饺的性能,给出了计算等效塑性铰长度的经验公式。
Equivalent Length-Weighted Method and Its Application on Evaluation of Highway Technology Status 等效长度加权法及其在公路技术状况评价中的应用
Effect of orifice radius on the mean axial velocity componentw_m. the inertial length I, the equivalent length of contraction δ, the flowrate q_x, the distance of reattachment point Z_ ( ais), the time constants τ_q τ_zand so on are discussed. 研究了节流孔半径对平均轴速分量wm、惯性长l、收缩部等效长度δ、流量qs、再附着点距离Z(ais)和时间常数τq、τz等的影响。
The result indicates that the critical load of dynamic instability is far more than that of static instability with regard to the equivalent length bars. 结果表明,对于等效长度直杆,动力失稳临界压力要远大于静力失稳的临界压力。
The equivalent algorithm of feeder fault location for single-phase-grounded fault with spur feeders is proposed through transform analytical method of equivalent length straight feeder with the same parameters. 对带分支馈线的单相接地故障测距首次提出相同参数下的等值长度直配线归算分析法。
This text regards the shaft as one well unit equivalent square length of the drum. 本文将抽水井当作一个与圆筒轴长相同的等效方形简单元来处理。
Based on the above framework, this thesis derives the related elements in the model, including embedment point, equivalent length, equivalent angle and drag distance, and finally solves the kinematic trajectory equation. 基于以上框架,本文推导了模型中的相关要素,包括嵌入点、等效缆长、等效拖曳角和拖曳距离,最终求得运动轨迹方程。
Therefore, firstly, this paper theoretically analyzed the contraction of inner vessels of the cryogenic tank after filling, put forward the concept of equivalent length of inner vessel and get the calculating model of the interspace volume change. 因此,本文首先从理论上分析充液后低温储罐内罐的冷缩量,提出了内罐当量长度的概念,进而得出夹层体积变化量计算模型。